Paper refining engine plug



PAPER REFINING ENGINE PLUG Filed June 21, 1935 2 Sheets-Sheet l ENGINE PLUG 2 Sheets-Sheet? PAPER REFINING Filed .June 21, 1935 Pill/l Patented Feb. 14, 1939 2,146,830

- UNITED'STATES PATENT OFFICE PAPER REFINING ENGINE PLUG some! n. Martindale, Middletown, Ohio, assignor to The Black-Clawson Company, Hamilton, Ohio, a. corporation of Ohio Application June 21, 1935, Serial No. 27,727

4 Claims. (01. 92-27) This invention relates to paper making maand the knife separators which are provided bechines, and more particularly to Jordan engine tween adjacent knives are usually constructed plugs and the like. as separate pieces assembled to the conical shell One object of the invention isthe provision of the plug.

5 of a Jordan engine plug or the like, having blades In accordance with the present invention, there 5 and spacer woods so arranged and constructed is provision for very securely seating the knives as to give unusual strength, rigidity and long in longitudinal slots provided in the frusto-conilife. cal plug shell, the latter being provided with a Another object is the provision of a plug of plurality of annular surface indentations on the character mentioned having a frusto-conical which knife holding bands are seated, the knives 10 surface provided with a series of knives or blades having recesses on their inner sides adapted for and separators or spacers for the blades, the consecure interlocking engagement with the bands struction being such that the knives are held by moving the knives inwardly in the slots and very firmly seated in the slots in a simple manner then longitudinally along the slots, as will be by annular bands provided in surface indentamore fully described. 15 tions in the plug, the separators being held The Jordan plug I0 comprises a frusto-conical against radial outward movement as they are shell ll, preferably of metal. In the shell is a secured to the knives by cooperating longitudinal series of longitudinally extending slots I! in surface irregularities on the knives and spacers. which the knives l4 are held, the slots, as shown,

Another object of the invention is the provision extending radially inwardly from the outer coni- 20 of a plug of the character mentioned in which the cal shell surface l3 with the sides of the slots su face indentations provide substantially cylinparallel to one another. The inner end of each drical surfaces on the plug body, terminating in of these slots, as shown, is arcuately curved, conabrupt shoulders against which the bands are forming to the cylindrical curvature of the inner held when the knives are moved into locking ensides of the knives, and thus giving a very strong 25 gagement with the bands. construction at the base of the lugs which pro- Other objects and advantages will be apparent ject externally from the plug body. As the cirfrom the following description, the appended cumference of the plug is considerably greater claims and the accompanying drawings, in at its larger end, additional shorter-slots are pro whichvided in the larger end of the plug as shown in 30 Fig. 1 is a side elevation of a Jordan engine Fig. 1 to accommodate the additional shorter plug embodying the present invention; knives l5.

Fig. 2 is a side elevation of one of the knives As will be more apparent from Figs. 3 and 5, or blades with which the plug is provided; the outer surface of the shell H is cut away so Fig. 3 is a longitudinal sectional view through as to provide a plurality of annular surface in- 5 the outer portion of the plug taken at one side dentations l6 which extend outwardly towards of one of the knives as indicated by the line 3-4 the smaller end of the plug to the frusto-coniof Fig. 4; cal shellsurface l3. At the inner end of each Fig. 4 is a section on the line 4-4 of Fig. 3;, surface indentation I6 is a shoulder H, which and preferably extends abruptly outwardly or ra- 40 Fig. 5 is a perspective view of a portion of the dially, to the shell surface l3. Seated on each plug showing portions of two of the knives and of the surface indentations is an annular knife one of the spacers in place. retaining band 18, each abutting against a shoul- Referring more particularly to the drawings der I1 and of such size as to lie entirely below by reference numerals, l0 designates generally the conical surface defined by the outer-surface 5 theplug of an engine of the Jordan type such of the shell. The several bands are of similar as is used in the refining of paper stock and-the construction although of different diameters in like. In such engines the frusto-conical plug accordance with the different diameters of the carries a series of knives which cooperate with several annular surface indentations of the shell.

another series of fixed knives provided on the The inner surfaces of the bands I! are prefer- 50 interior of an outer shell within which the plug ably substantially cylindrical, and the surface is rotatably supported, the shell being of the indentations iii are also preferably substantially same frusto-conical shape as the'plug, and the cylindrical so that the bands can be readily apknives on the plug and shell operating almost in plied merely by moving them endwise towards running contact with one another. The knives the larger end of the plug until they come up g against the respective shoulders II. It is preferred that the bands I8 be shrunk in place to more adequately center them with the axis of rotation of the plug.

The inner surface of each of the bands I8 is spaced some distance outwardly from the inner ends of the slots I2. Each knife I4 as shown in Fig. 2, is provided with recesses 2| which are longitudinally spaced apart along the inner side of the knife in accordance with the longitudinal spacing.01' bands II. At one end of each of the recesses 2|, the knife is extended, forming a tongue 22 for each recess and projecting toward the opposite side of the recess, as shown. The width of the recess 2|, at the bottom of the knife, is slightly larger than the width of the band I8, so that the knife can be inserted in the slot I2 and moving it radially inwardly and then moving it in the direction of its length toward the larger end of the plug. As the knife is moved towards the larger end of the plug the tongue 22 is inserted below the band I8 where the band crosses the slot .I2 in which the knife is received. The band I8 then holds the knife against radial outward movement, and gives a firm seating action of the knife in the bottom of the slot, as the upper surface 23 of the projecting tongue on the knife extends at an angle to the lower edge of the knife, the angularity of the surface 23 corresponding to that of the inner surface of the band I8. That is, where the inner surface of the band I8 is cylindrical, the surface 23 on the projecting knife tongue extends parallel to the longitudinal axis of the plug, so that when the knife is moved endwise toward the larger end of the plug, a wedging action will obtain between the surface 23 on the tongue and the inner surface of the ring, forcing the knife securely into the bottom of the slot. This wedging action between the knife and the band very firmly secures the knife in position when the knife is moved as far as it will go toward the larger end of the plug. And since the band I8 abuts against the shoulder portion ll of the shell, the position of the band will not be disturbed when the knife is moved in the direction of its length toward the larger end of the plug, but on the contrary will only be held more tightly against the shoulder. It is, therefore, unnecessary to provide holding pins or the like to fix the position of the band on the shell, and as the inside diameter of the band is such that the band can be applied in its final form preferably after first heating the band, merely by moving it over the smaller end of the shell and into abutting engagement with the shoulder II it will be apparent that the assembly of these parts is a comparatively simple operation.

It will be understood that the various bands and recesses in the knives are of similar construction although varying in diameters in accordance with the diameter of the shell at this various band location, so that the knives are si-' multaneously interlocked with the bands and are held down at a number of spaced points.

The normal operating force on the knives, during operation, is such as to tend to move them toward the larger end of the shell, but this tendency merely serves to tighten the wedging interlock with the encircling bands I8 and serves moreover, if the bands are not perfectly tight on their seats, to more securely hold the bands I8 against their cooperating abutments or shouliders. Additional means, however, is preferably provided to prevent endwise movement of the knives from their final assembled positions toward the smaller end of the plug. Such movement is prevented by a holding means which may be in the form of a ring 25 which is secured as by means of shrinking it on the smaller end of the shell at the ends of the knives, one side of the ring 25 bearing against the knife ends and preventing movement of the knives. Movement of the knives towards the larger end of the shell is prevented by the wedging engagement of the knives and the bands I8, and by means of the shoulders I! which determine the position of the bands. The knives are, therefore, secured against longitudinal movement in either direction. Since they cannot move longitudinally, they cannot move outwardly in the slots in view of their interlocking engagement with the several bands I8.

The knives are seated to a considerable radial distance in the slots I2, and to reinforce and separate the knives outwardly of the conical surface of the plug shell a number of separators of wood or other suitable material are employed, as shown, so as to firmly interbrace the knives out to a point a suitable distance from the outer or cutting ends. These woods or separators are interlocked withthe knives by means of longitudinal surface irregularities on the knives and the separators so that the latter are prevented from moving outwardly, or rising. As shown in Figs. 4 and 5, each knife is provided with a longitudinally extending projecting rib 21 at each side at a suitable location some distance out from the shell surface I3. These ribs extend parallel to the shell surface I3 and interfit with longitudinally extending depressions 28 provided in the sides of the separators 29. The separators are tapered longitudinally toward the smaller end of the plug shell, in accordance with the inclination of the knives toward one another as they extend toward the smaller end of the shell. The separators are positioned between adjacent knives by moving them endwise toward the smaller end of the shell and between the knives, and are driven firmly in position so as to securely interbrace the portions of the knives which project outwardly from the shell. An end plate or the like may be bolted or secured to the larger end of the shell, overlapping the ends of the separators 29 and preventing their movement toward the larger end of the plug. As the projections 21 on the knives are of substantial width, the separators are securely held against outward movement, even though the outer width of the separator is greater than its width where it contacts with the shell surface. As the knives are very securely held and seated in the slots by their described engagement with the holding bands I8, and as the knives are interlocked with the separators 28 it will be apparent that all of the parts are firmly held together in their definite predetermined positions, while the construction is such that the various parts can be readily assembled and readily constructed. The replacement of worn or damaged knives or separators can also be readily effected.

While the form of apparatus herein described constitutes a preferred embodiment of the invention, it is to be understood that the invention is not limited to this precise form of apparatus, and that changes may be made therein without departing from the scope of the invention which is defined in the appended claims.

What is claimed is:

1. An engine plug of the character described comprising a shell having a conical outer surface provided with a series of longitudinally extending slots extending inwardly from the outer shell surface, and having a plurality of annular surface indentations axially spaced apart and each terminating in a. shoulder which extends outwardly to the outer surface of the shell and providing a substantially cylindrical surface extending to the conical surface of the shell, a series of substantially cylindrical bands fitting on said annular surface indentations and abutting said shoulders with the inner surfaces of the bands spaced outwardly of the inside ends of the slots, said bands being located entirely within the cone defined by the outer surface of the shell, a series of knives having their inner ends fitting within said slots and having interlocking engagement with said bands preventing radial outward movement of the knives from their normal position, said knives each being adapted for insertion in one of said slots and interlocking engagement with a plurality of said bands by movement of the knife toward the plug axis and then longitudinally toward the larger end of the plug, and knife separators on the outer surface of the shell between the knives, said knife separators and knives having interlocking longitudinally extending surface irregularities holding the separators against radial outward movement.

2. An engine plug of the character described comprising a shell having a conical outer surface provided with a series of longitudinally extending slots extending inwardly from the outer shell surface, and having a plurality of annularsurface indentations axially spaced apart and providing a substantially cylindrical surface extending to the conical surface of the shell, a series of substantially cylindrical bands fitting on said annular surface indentations with the inner surfaces of the bands spaced outwardly of the inside ends of the slots, said bands being located entirely within the cone defined by the outer surface of the shell, a series of knives having their inner ends fitting within and engaging the sides and bottoms of said slots and having interlocking engagement with said bands preventing radial outward movement of the knives from their normal position, said knives each being adapted for insertion in one of said slots and interlocking engagement with a plurality of said bands by movement of the knife toward the plug axis and then longitudinally toward the large end of the plug, means preventing endwise movement of said knives toward the smaller end of the plug, and a series of knife separators on the outer surface of the shell between the knives. each separator having a longitudinal surface irregularity on each side thereof interfltting with longitudinal surface irregularities of a pair of adjacent knives preventing radial outward movement of the separator.

3. A Jordan engine plug comprising a shell having a conical outer surface provided with a series of longitudinally extending deep slots extending inwardly from the outer shell surface, and having a plurality of'annular surface indentations axially spaced apart and terminating toward the larger end of the plug in shoulders which extend outwardly to the outer surface of the shell, each indentation providing a substantially cylindrical surface intersecting the conical outer surface of the shell, a series of bands on said annular surface indentations and abutting said shoulders with the inner surfaces of the bands of substantially cylindrical form and spaced outwardly of the inside ends of the slots, the outer surface of each band lying within the cone defined by the outer surface ofthe shell, a series of knives having their inner ends fitting within said slots and having interlocking engagement with said bands preventing radial outward movement of the knives from their normal position, each knife having a recess for receiving one of said bands and having a projecting surface extending at an angle to theknife edge adapted for wedging engagement with the inner surface of the band when the knife is moved longitudinally toward thelarger end of the shell, means preventing endwise movement of the knife toward the smaller end of the shell, and a series of knife separators on the outer surface of the shell between the knives, each separator having longitudinal surface irregularities interfitting with longitudinal surface irregularites on the knives preventing outward movement of the separators.

4. An engine plug of the character described comprising a shell having a conical outer surface provided with a series of longitudinally extending deep slots extending inwardly from the outer shell surface, the radial depth of the slots being several times the slot Width, said shell having a plurality of annular surface indentations axially spaced apart and terminating towards the larger end of the shell in shoulders which extend outwardly to the outer surface of the shell, each of said indentations extending towards the smaller end of the shell and intersecting the conical surface of the shell and providing a substantially cylindrical band receiving surface which is at 7 side of the slots, the inner surfaces of the bands being located within the cone-defined by the outer surface of the shell, a series of knives having their inner ends fitting within said slots and having interlocking engagement with said bands preventing radial movement of the knives from their normal position, each knife having a recess for receiving one of said bands and having a projecting surface extending at an angle to the knife edge adapted for wedging engagement with the inner surface of the band when the knife'is moved longitudinally toward the larger end of the shell.

HOMER D.

CERTIFICATE OF CORRECTION. Patent NO. 2,lll6:850. February 11;, 1959.

HOMER D. MARTINDALE.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 5, first column, line 51, after the word "extending" insert deep; line 52, after "inwardly" insert a distance several times the slot width; line 55-, after "surface" and before the comma insert and each terminating in a transversely curved surface so as to be devoid of sharp corners; line 1 5, after "ends" insert transversely curved and; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 11th day of April, A. D. 1959.

Henry Van Arsdale (Seal) Acting Commissioner of Patents. 

